190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 2-2
2.1 Equipment Descriptions
2.1.1 GTN Xi Navigators and GMA 35
NOTE
For pinouts and wiring diagrams, refer to GTN Xi Part 23 AML STC Installation Manual
(P/N 190-01007-C0).
The GTN Xi SBAS navigators are a family of aviation panel-mounted retrofit products. The following
sections will describe the available functions for each unit in the GTN Xi family.
2.1.1.1 GTN 6XX Xi
The GTN 6XX Xi navigators are a family of panel-mounted GPS/NAV/COM navigators that include the
GTN 625Xi, GTN 635Xi, and GTN 650Xi. GTN 6XX Xi units are 6.25 inches wide and 2.65 inches tall.
They feature an 834 × 370 pixel color LCD touchscreen.
The GTN 625Xi is a GPS/SBAS unit that meets the requirements of TSO-C146c and may be approved for
IFR en route, terminal, oceanic, non-precision, and precision approach operations when installed in
accordance with the instructions in the manuals referenced in the GTN AML STC. The GTN 635Xi
includes all of the features of the GTN 625Xi in addition to an airborne VHF/COM transceiver. The
GTN 650Xi includes all of the features of the GTN 635Xi in addition to an airborne VOR/localizer (LOC)
receiver and glideslope (G/S) receiver.
2.1.1.2 GTN 7XX Xi
The GTN 7XX Xi navigators are a family of panel-mounted GPS/NAV/COM navigators that include the
GTN 725Xi and GTN 750Xi. GTN 7XX Xi units are 6.25 inches wide and 6.00 inches tall. They feature an
834 × 986 pixel color LCD touchscreen.
The GTN 725Xi is a GPS/SBAS unit that meets the requirements of TSO-C146c and may be approved for
IFR en route, terminal, oceanic, non-precision, and precision approach operations when installed in
accordance with the instructions in the manuals referenced in the GTN AML STC. The GTN 750Xi
includes all of the features of the GTN 725Xi in addition to an airborne VHF communications transceiver
and airborne VOR/localizer (LOC) and glideslope (G/S) receivers. Additionally, GTN 7XX Xi units have
the capability to remotely control GMA 35 audio panel functions.
2.1.1.3 GMA 35 Audio Panel
The GMA 35 Audio Panel is a remote-mounted marker beacon receiver and audio panel with a six-position
intercom system (ICS) that interfaces to the communications and navigation radios, headsets,
microphones, and speakers. The ICS includes electronic cabin noise de-emphasis, two stereo music inputs,
and independent pilot/co-pilot/passenger volume controls. The intercom provides three selectable isolation
modes. A pilot-selectable cabin speaker output can be used to listen to the selected aircraft radios or to
broadcast PA announcements.
The audio panel relies on a GTN 7XX Xi to control and display the audio functions. The GMA 35
interfaces to the GTN 7XX Xi through RS-232 for control and display of audio panel functions.
The GMA 35c provides the functionality of the GMA 35, with the capability to pair Bluetooth™ audio
sources. This enables the distribution of audio to ICS positions when using a compatible iOS or Android™
device. The GMA 35c supports up to ten stored devices and one active Bluetooth device.
